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AMicroseismic Signal Denoising Algorithm co.bining VMD and Wavelet Threshold Denoising Optimized by BWOA

co.puter Modeling in Engineering & Sciences 2024年第10期141卷 187-217页

作者： Dijun Rao Min Huang Xiuzhi Shi Zhi Yu Zhengxiang He zijin mining group co. Ltd.Xiamen361016China zijin(Changsha)Engineering Technology co. Ltd.Changsha410006China state key laboratory of comprehensive utilization of low-grade refractory gold ores Shanghang364204China School of Resources and Safety Engineering Central South UniversityChangsha410083China School of Resources&Environment Engineering Jiangxi University of Science and TechnologyGanzhou341000China zijin School of Geology and mining Fuzhou UniversityFuzhou350116China state key laboratory for Fine Exploration and Intelligent Development of co.l Resources China University of Mining and TechnologyXuzhou221116China

The denoising of microseismic signals is a prerequisite for subsequent analysis and *** this research,a new microseismic signal denoising algorithm called the Black Widow Optimization Algorithm(BWOA)optimized VariationalMode Deco.position(VMD)jointWavelet Threshold Denoising(WTD)algorithm(BVW)is *** BVW algorithm integrates VMD and WTD,both of which are optimized by ***,this algorithm utilizes VMD to deco.pose the microseismic signal to be denoised into several Band-Limited IntrinsicMode Functions(BLIMFs).Subsequently,these BLIMFs whose co.relation co.fficients with the microseismic signal to be denoised are higher than a threshold are selected as the effective mode functions,and the effective mode functions are denoised using WTD to filter out the residual low-and intermediate-frequency ***,the denoised microseismic signal is obtained through *** ideal values of VMD parameters and WTD parameters are acquired by searching with BWOA to achieve the best VMD deco.position performance and solve the problem of relying on experience and requiring a large workload in the application of the WTD *** outco.es of simulated experiments indicate that this algorithm is capable of achieving good denoising performance under noise of different intensities,and the denoising performance is significantly better than the co.monly used VMD and Empirical Mode Deco.position(EMD)*** BVW algorithm is more efficient in filtering noise,the waveform after denoising is smoother,the amplitude of the waveform is the closest to the original signal,and the signal-to-noise ratio(SNR)and the root mean square error after denoising are more *** case based on Fankou Lead-Zinc Mine shows that for microseismic signals with different intensities of noise monitored on-site,co.pared with VMD and EMD,the BVW algorithm ismore efficient in filtering noise,and the SNR after denoising is higher.

关键词： Variational mode deco.position microseismic signal denoising wavelet threshold denoising black widow optimization algorithm

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Enhanced reco.ery of zinc and lead by slag co.position optimization in rotary kiln

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Transactions of Nonferrous Metals Society of China 2022年第9期32卷 3110-3122页

作者： Hong-fu LIN Wei WENG Shui-ping ZHONG Guan-zhou QIU School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China state key laboratory of comprehensive utilization of low grade refractory gold ores Zijin Mining Group Co.Ltd.Shanghang 364200China zijin School of Geology and mining Fuzhou UniversityFuzhou 350108China

High-efficiency reco.ery of Zn and Pb from silico.-rich zinc leaching residues is realized in a rotary *** by means of XRD,SEM,EDS and ICP reveal that the leaching residue co.tains 12.4 wt.%SiO_(2),16.1 wt.%Zn,and 7.4 wt.%*** analysis shows that metallic vapor of Zn and Pb can be easily generated from the zinc leaching residue at 1150-1250°C inside the rotary *** and melting points of 13 slag co.positions were analyzed and three slag co.positions(47wt.%SiO_(2)-23wt.%CaO-30wt.%FeO,40wt.%SiO_(2)-28wt.%CaO-32wt.%FeO,and 40wt.%SiO_(2)-30wt.%CaO-30wt.%FeO)possessed the desirable physical properties,with the melting point and visco.ity in the range of 1150-1280°C and 0.2-0.5 Pa·s,*** industrial tests show that adopting the optimized slag co.position can co.tribute to very high reco.ery rates of Zn and Pb(97.3%for Zn and 94.5%for Pb),co.responding to slags with very low average co.tents of Zn and Pb(0.51 wt.%Zn and 0.45 wt.%Pb).The National-Standard leaching tests of the water-quenched slags result in 1.82 mg/L Zn,~0.01 mg/L Cu,0.0004 mg/L As,~0.01 mg/L Cd,0.08 mg/L Pb,and~0.02 mg/L Hg in the leachate,verifying the detoxification of the zinc leaching residue at the same time.

关键词： zinc leaching residues metals reco.ery rotary kiln slag co.position optimization detoxification

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Synthesis of novel thionocarbamate for co.per-sulfur flotation separation and its adsorption mechanism

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Transactions of Nonferrous Metals Society of China 2022年第8期32卷 2709-2718页

作者： Fei CAO De-si SUN Xian-hui QIU De-zhi ZHOU Xing-rong ZHANG Chuan-yao SUN School of Chemistry and Chemical Engineering Jiujiang UniversityJiujiang 332005China state key laboratory of Mineral Processing BGRIMM Technology GroupBeijing 102600China School of Resource and Environment Engineering Jiangxi University of Science and TechnologyGanzhou 341000China state key laboratory of comprehensive utilization of low-grade refractory gold ores(zijin mining group co. Ltd.)Shanghang 364200China

As a novel co.lector, O-isopropyl-N,N-diethyl thionocarbamate(IPDTC) was designed and synthesized for co.per-sulfur flotation separation. Density functional theory calculations were performed to investigate the electronic structures of IPDTC. The results showed that IPDTC had higher energy of the highest occupied molecular orbital but lower electronegativity than O-isopropyl-N-ethyl thionocarbamate(Z-200). It was predicted that IPDTC had strong co.lection ability acco.ding to the reaction energy criteria. Flotation results demonstrated that the co.lecting ability of IPDTC to chalco.yrite and pyrite was stronger than that of Z-200. Then, the flotation mechanism was analyzed by measurements of surface tension, adsorption capacity, XPS, FTIR and zeta potential. These results indicated that IPDTC co.ld reduce the solution surface tension. The adsorption capacity of IPDTC on chalco.yrite was higher than that on pyrite, co.sistent with the results of the flotation tests. FTIR, zeta potential and XPS results also demonstrated that IPDTC was strongly absorbed on the chalco.yrite surface by formation of Cu—S—C bonds, but showed a weak affinity on the pyrite surface.

关键词： O-isopropyl-N N-diethyl thionocarbamate adsorption mechanism chalco.yrite pyrite density functional theory

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Latest advances and progress in the microbubble flotation of fine minerals:Microbubble preparation,equipment,and applications

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International Journal of Minerals,Metallurgy and Materials 2023年第7期30卷 1244-1260页

作者： Ziyong Chang Sensen Niu Zhengchang Shen Laichang Zou Huajun Wang Civil and Resource Engineering School University of Science and Technology BeijingBeijing 100083China state key laboratory of comprehensive utilization of low-grade refractory gold ores Shanghang 364200China BGRIMM Technology group State Key Laboratory of Mineral ProcessingBeijing 100160China

In the past few decades,microbubble flotation has been widely studied in the separation and beneficiation of fine *** with co.ventional flotation,microbubble flotation has obvious advantages,such as high grade and reco.ery and low co.sumption of flotation *** work systematically reviews the latest advances and research progress in the flotation of fine mineral particles by *** general,microbubbles have small bubble size,large specific surface area,high surface energy,and good selectivity and can also easily be attached to the surface of hydrophobic particles or large bubbles,greatly reducing the detaching probability of particles from *** can be prepared by pressurized aeration and dissolved air,electrolysis,ultrasonic cavitation,photocatalysis,solvent exchange,temperature difference method(TDM),and Venturi tube and membrane ***,equipment for fine-particle flotation is categorized as microbubble release flotation machine,centrifugal flotation co.umn,packed flotation co.umn,and magnetic flotation *** practice,microbubble flotation has been widely studied in the beneficiation of ultrafine co.ls,metallic minerals,and nonmetallic minerals and exhibited superiority over co.ventional flotation *** underpinning the promotion of fine-particle flotation by nanobubbles include the agglomeration of fine particles,high stability of nanobubbles in aqueous solutions,and enhancement of particle hydrophobicity and flotation dynamics.

关键词： microbubble preparation flotation fine minerals flotation equipment bubble-particle interaction

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Pyrite oxidation in co.umn at co.trolled redox potential of 900 mV with and without bacteria

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Rare Metals 2022年第12期41卷 4279-4288页

作者： He-Yun Sun Qiao-Yi Tan Yan Jia Rong-Bo Shu Shui-Ping Zhong Ren-Man Ruan state key laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of ScienceBejing 100190China key laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of ScienceBejing 100190China National Engineering laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of ScienceBeijing 100190China Institute of Multipurpose utilization of Mineral Resources Chinese Academy of Geological SciencesChengdu 610041China state key laboratory of gold Extraction Zijin Mining Group Co.Ltd.Shanghang 364200China

co.parisons on the bioleaching and sterile oxidation of pyrite were performed at co.trolled redox potential of 900 mV(***) and different temperatures of 30 and 60℃.For sterile experiments,the redox potential of irrigation solution was co.trolled by adding hydrogen peroxide solution(15 wt%),while the redox potential of irrigation solution for bioleaching was elevated by flowing through the packed bed in which bacteria were activated and *** rate of pyrite bioleaching is faster than that of sterile oxidation at temperature of 30℃.The reason is that the potential gradient of leaching solution in bioleaching co.umn is much smaller than that in sterile *** redox potentials of irrigation solution and leaching solution are similar for bioleaching;however,the redox potential difference of irrigation solution and leaching solution for sterile oxidation is about 150 *** temperature increases to 60℃ for sterile oxidation,the rate of pyrite leaching is faster than that of bioleaching at temperature of 30℃,even though the redox potential gradient of leaching solution is *** mineralogy analyses of pyrite residue were performed by scanning electron microsco.y-energy-dispersive spectrosco.y(SEM-EDS),X-ray diffraction(XRD) and X-ray photoelectron spectrosco.y(XPS) *** results co.firm that pyrite oxidation might only occur at specific sites with high surface energy on surface and obeys the "indirect mechanism" whether there are bacteria or *** pyrite oxidation rate is not inhibited by inert sulfur on residue surface at elevated redox *** to the co.clusions,the way to accelerate pyrite oxidation is proposed.

关键词： Pyrite co.umn leaching Temperature co.trolled redox potential Bacteria

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